One scenario experienced by myself:
I went with my gf to sim lim square 2 years ago to purchase a
digital camera. I visited every shop and finally I've found a shop
that quoted me $450 for that. He explained every dumb function of
it to me and my gf and lastly, during payment time. I asked if
there was any warranty for the product. He replied no. I became
inquisitive and asked if it was an export set and he said it was a
local set but it doesn't come with warranty. LOL. I wanted to walk
away, however, my gf admired that digicam for quite some time so I
paid him the money with the additional amount of GST.
Summary for the above paragraph: I've bought a local set
digicam for $450 without warranty.
I went to a shop on the first level and inquired about the price
of it again; the person-in-charge of quoting the price wasn't
around during my previous request for quotations. He quoted me $350
with warranty of 1 year. 
Summary for the above paragraph:1 of the shops on the
first level quoted me $350 with 1 year warranty
Devilish Anger engulfed me, I rushed back to the shop that had
sold me the digicam and told me about this. He said it's a
different model and i insisted that it was the same exact
model. 
Such audacity, he sold me an export set at a price of $100 more
than the local set and actually tried to claim GST for export
sets.
I tried to reason with him. He declined. Well, I told him I'll
get write to the Strait times, chinese papers, inform reporters as
well as have my problem settle by CASE. He budged out and refunded
my money.
Last but not least, I pointed my middle finger at him after
leaving the shop and he just stood there.
ar hahah
